Two things to consider about this list:
- There will be a lot of albums from the new wave of British heavy metal, because most old school metal bands play a style like this
- I will probably leave out albums that some metal heads think are classics. If you disagree, make your own list! If there's some great album I missed I'll give it a listen and decide if I like it enough to include it.

Yes to 2, 5, 8, 9 & 14. Albums I would consider are Sabbath Bloody Sabbath or at least something from Sabbath, Holy Diver (Dio), Practice what you preach (Testament), Machinehead (Deep Purple - since you opened the door with Rainbow), not to mention something from Slayer and probably Megadeth as well - oh yes and definitely Operation Mindcrime (Queensryche).